The animals constantly grew new shell material ... which scientists believe helped provide buoyancy and move ammonites through the water. It’s unclear whether ammonites were very efficient ...

The untamed wilderness of prehistoric North America was a realm where terrifying prehistoric creatures reigned supreme ... enough to wander too close to the water. With a bite force rivaling ...

One peels out of formation and dives into the water with a splash ... limestone 150 million years old, the creature lay with its mouth agape in a pose of prehistoric horror.

CELINA - Though dinosaurs are the most notable of the prehistoric animals, smaller mammals and fish walked and swam in Ohio, ...